Contrast Checker - WCAG Color Contrast
Free WCAG contrast checker. Compute the contrast ratio between foreground and background colors locally, and check AA/AAA readability. 100% local.
About 配色设计
Compute foreground/background contrast and check WCAG AA/AAA. This tool runs entirely in your browser locally — no file upload, your privacy is protected, and speed is unaffected by network.
FAQ
Will my files be uploaded?
No. All processing happens locally in your browser; files never leave your device.
Which formats / scenarios are supported?
contrast checker, wcag, color contrast, readability, contrast ratio, aa standard and more can be done on this page.
Do I need an internet connection?
After the page loads, conversion/computation runs locally and works offline (except features relying on external fonts/libraries).